-34.07% is the change from 317 to 209
Calculation steps:
[( 209 - 317 ) ÷ 317] x 100 = -34.07%
Formula
Percentage change = [(209 - 317) / 317] x 100
Subtract the new number by the original number
209 - 317 = -108
-108 ÷ 317 = -0.34069400630914826
-0.34069400630914826 x 100 = -34.07%